The reason why the hydraulic oil is polluted is that the hydraulic oil is polluted mainly because of the following aspects:
(1) sand, pipeline of hydraulic system and hydraulic components in cutting, abrasive, welding slag, rust, dust and dirt in the system before using the washing is not clean, in the hydraulic system, the dirt into the hydraulic oil.
(2) outside dust, sand and so on, in the hydraulic system work process, through the reciprocating telescopic piston rod, flows back to the oil leak of the oil tank, and so on, enters the hydraulic oil. In addition in maintenance, little attention will be made into dust, lint and other hydraulic oil.
(3) hydraulic system constantly produces itself directly into the dirt, and hydraulic oil, such as metal particles wear and sealing material, particles or fibers and oil filter materials because of the temperature off the oxidation and generation of colloidal material etc..